<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <!-- 鼠标移出隐藏导航列表 -->
      <div class="nav-left" @mouseleave="isShowNavList = false">
        <!-- 鼠标移入显示导航列表 -->
        <h2 class="all" @mouseenter="isShowNavList = true">全部商品分类</h2>

        <!-- 需求：sort是那个三级导航栏，因为在home页面中需要一直全部展示，
            在search页面中，上来是隐藏的，hover才显示
         -->

        <!-- 判断路径是否是home，是home则为ture，则显示 -->
        <div class="sort" v-if="$route.path === '/home' || isShowNavList">
          <div class="all-sort-list2">
            <div class="item" v-for="c1 in categoryList" :key="c1.categoryId">
              <h3>
                <!-- 方式一：router-link的字符串写法 -->
                <router-link
                  :to="{
                    name: 'Search',
                    query: {
                      ...$route.query, //为了保留搜索框keyword的参数
                      category1Id: c1.categoryId,
                      categoryName: c1.categoryName
                    }
                  }"
                >
                  {{ c1.categoryName }}
                </router-link>
              </h3>
              <div class="item-list clearfix">
                <div class="subitem">
                  <dl
                    class="fore"
                    v-for="c2 in c1.categoryChild"
                    :key="c2.categoryId"
                  >
                    <dt>
                      <!-- 方式一：router-link的对象写法 -->
                      <router-link
                        :to="{
                          name: 'Search',
                          query: {
                            ...$route.query, //为了保留搜索框的keyword参数
                            category2Id: c2.categoryId,
                            categoryName: c2.categoryName
                          }
                        }"
                      >
                        {{ c2.categoryName }}
                      </router-link>
                    </dt>
                    <dd>
                      <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                        <!-- 方式一：router-link的对象写法 -->
                        <router-link
                          :to="{
                            name: 'Search',
                            query: {
                              ...$route.query, //为了保留搜索框keyword的参数
                              category3Id: c3.categoryId,
                              categoryName: c3.categoryName
                            }
                          }"
                        >
                          {{ c3.categoryName }}
                        </router-link>
                      </em>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
    </div>
  </div>
</template>

<script>
// 引入获取三级列表数据的函数
import { reqGetCategoryList } from '@/api/home'
export default {
  name: 'TypeNav',
  async mounted() {
    const result = await reqGetCategoryList()
    // 将得到的结果放入data中
    this.categoryList = result
  },
  data() {
    return {
      categoryList: [],
      // 初始不展示三级导航列表
      isShowNavList: false
    }
  }
}
</script>

<style lang="less" scoped>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 0 0 20px;
            margin: 0;
            &:hover {
              background-color: #e1251b;
            }

            a {
              display: block;
              width: 100%;
              height: 100%;
              color: #333;
              cursor: pointer;
              &:hover {
                text-decoration: none;
                color: #fff !important;
              }
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                    &:hover a {
                      text-decoration: none;
                      color: red !important;
                    }
                  }
                }
              }
            }
          }

          &:hover {
            .item-list {
              display: block;
            }
          }
        }
      }
    }
  }
}
</style>
